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| POWER&RF Step-up DC-DC converter / white LED driver IC DC-DC / LEDIC TK11840L-G DESCRIPTION The TK11840L-G is a step-up DC-DC converter that drives an external NPN power transistor using a constant frequency PWM architecture. The IC works with a wide operating supply range (1.8V to 10V) and has an adjustable output. The IC timing oscillator operating frequency is programmable and can be set up to 1MHz. It also incorporates a soft-start circuit and a short-circuit detection function of a timer-latch type. TK11840L-GPWM 1.8V10V 1MH FEATURES Operation from 1.8V to 10.0V supply Adjustable output voltage High speed adjustable OSC: up to 1MHz Incorporates a soft start circuit Incorporates a short circuit detection of a timer-latch Totem-pole type output in which drive current is adjustable using an switching resistor: pin 4 1A or less shutdown current Small package: SOT23L-8 : VOP=1.8~10.0V : 1MHz Tr. (NPN) 1A : SOT23L-8 APPLICATIONS The White LED Driving Systems: 2 to 48 or more For Back-lighting and Front-lighting, Flashlights etc. Mobile Communication Systems: Cellular Phone, PHS, DSC, PDA, Computer Peripheral Equipment Battery & Dry Cell Battery Systems Portable Equipment Step-up DC-DC Converter (Voltage Supply) Camera, Radio, Communications Equipment etc VCD Bias LED: , , : PHSDSCPDA DC-DC VCD PACKAGE OUTLINE Part name TK11840L-G Package Marking Pin configuration D40 See next page ORDERING INFORMATION Ordering information TK11840LTL-G SOT23L-8 Package code L: SOT23L-8 Environment code G: Lead free Storage direction TL: Left type ABSOLUTE MAXIMUM RATINGS Parameter Operating Voltage Range Operating Temperature Range Power Dissipation Operating Frequency Range Symbol VOP TOP PD fOP Rating 1.8 to 10.0 -20 to +85 400 to 1 Unit Remarks V C mW MHz 2005 SPRING POWER&RF ELECTRICAL CHARCTERISTICS Parameter Switch Maximum Voltage Switch Maximum Current Switch Maximum Base Current Maximum Duty Ratio Error Amplifier Reference Voltage Quiescent Current Shutdown Supply Current Symbol VSW, max ISW, peak IOut, max DMAX VEA IIN, ON IIN,OFF MIN Value TYP MAX Units VIN=2.0V, TA=25C Conditions Depending on external Tr. Depending on external Tr. 65 0.48 75 0.50 5.0 0.1 50 85 0.52 9.0 1 mA % V mA uA Adjustable by RB BLOCK DIAGRAM EaIn FB 1 8 0.1F SCP OSC 2 Soft Start Short Circuit Protection OSC VCC 7 RT 3k CT 270pF Vcc 3 1F BR/CTL RB 620 Reference Voltage Supply 1.3V Output Drive Control Circuit 6 GND 4 5 Out 2005 SPRING POWER&RF 6 WHITE LED DRIVER APPLICATION WITH ON/OFF CONTROL Designed Performance Input Voltage LED Current Oscillation Frequency Inductor Peak Current Coil (TOKO) List of common components VIN=2.5 to 10.0V ILED=20mA 260kHz 560mA Type D52LC A914BYW-100M Parameter Coil Input Capacitor Output Capacitor Short Circuit Protection Resistor Bias Resistor Time Capacitor Time Resistor Feedback Capacitor VOUT Symbol Value L CIN COUT CSCP RB CT RT CFB 10 4.7 2.2 0.1 2 270 6.8 0.1 Unit H F F F k pF k F TK11840L 1 CSCP VIN 2 3 RB 4 Ealn SCP VCC BR/CTL L FB OSC GND VOUT 8 7 6 5 CFB CT RT Sw.Tr. D CTL CIN COUT RLED 16 WHITE LED DRIVER APPLICATION Designed Performance Input Voltage LED Current Oscillation Frequency Inductor Peak Current Coil (TOKO) List of common components VIN=121V ILED=20mA+20mA 440kHz 300mA Type D52LC A914BYW-470M Parameter Coil Input Capacitor Output Capacitor Short Circuit Protection Resistor Bias Resistor Time Capacitor Time Resistor Feedback Capacitor Symbol Value L CIN COUT CSCP RB CT RT CFB VOUT 47 4.7 10 0.1 2 1000 1 0.1 Unit H F F F k pF k F TK11840L 1 CSCP VIN.IC CIN.IC 1F 2 3 RB 4 Ealn SCP VCC BR/CTL L VIN CIN FB OSC GND VOUT 8 7 6 5 CFB CT RT Sw.Tr. D COUT 24 24 2005 SPRING POWER&RF VOUT=32V STEP-UP DC-DC CONVERTER FOR LDC/VCD BIAS APPLICATION Designed Performance Input Voltage VIN=4.5 to 5.5V Output Current IOUT=up to 10mA Output Voltage VOUT=32V Oscillation Frequency 110kHz Inductor Peak Current 250mA Coil (TOKO) Type D52LC A914BYW-101M List of common components Parameter Coil Input Capacitor Output Capacitor Short Circuit Protection Resistor Bias Resistor Time Capacitor Time Resistor Feedback Capacitor VOUT R2 CR2 360k 1000pF R1 5.6k Symbol Value L CIN COUT CSCP RB CT RT CFB 100 4.7 10 0.1 2 1000 4.7 0.1 Unit H F F F k pF k F TK11840L 1 CSCP VIN 2 3 RB 4 Ealn SCP VCC BR/CTL L FB OSC GND VOUT 8 7 6 5 CFB CT RT Sw.Tr. D CIN COUT VOUT=5V STEP-UP DC-DC CONVERTER FOR SPEAKER DRIVER APPLICATION Designed Performance Input Voltage Output Current Output Voltage Oscillation Frequency Inductor Peak Current Coil (TOKO) List of common components VIN=3.0 to 4.0V IOUT=up to 300mA VOUT=5.0V 740kHz 800mA Type D412F 972AS-4R7M Parameter Coil Input Capacitor Output Capacitor Short Circuit Protection Resistor Bias Resistor Time Capacitor Time Resistor Feedback Capacitor VOUT R2 68k R1 7.5k CR2 10pF Symbol Value L CIN COUT CSCP RB CT RT CFB 4.7 4.7 22 0.1 1 270 2.2 0.1 Unit H F F F k pF k F TK11840L 1 CSCP VIN 2 3 RB 4 Ealn SCP VCC BR/CTL L FB OSC GND VOUT 8 7 6 5 RFB CFB 2.2k CT RT Sw.Tr. D CIN COUT * Please inquire us about applications except above. 2005 SPRING |
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